By thus controlling and partially eliminating the aggregate gas-effect, they succeeded in making a small radiometer, horizontally suspended, into a delicate and reliable measurer of the intensity of the radiation incident on it.
The moon was the earliest " measurer " both of time and space; but its services can scarcely have been rendered available until stellar " milestones " were established at suitable points along its path.
The selection of a standard may be regarded as a matter of arbitrary choice; that is to say, it would be possible to use any continuous time-measurer, and to adapt all scientific results to it.
But the daily survey of the sun (occasionally also the function of the moon as measurer of time), together with his importance for life, secured him a high moral rank; and Rh, united with the Theban Ammon, became (under the New Empire) the leading god of Egypt for a thousand years, " He who hath made all, the sole One with many hands."
Lucna, the shining one, lucere, to shine, for the moon, but preserves the word in mensis, month; the ultimate root for "moon" and " month " is usually taken to be me-, to measure, the moon being a measurer of time), in astronomy, the name given to the satellite of any planet, specifically to the only satellite of the earth.